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Sensors 2018, 18(2), 542;

Plane Wave SH0 Piezoceramic Transduction Optimized Using Geometrical Parameters

Département de génie mécanique, École de technologie supérieure, 1100 rue Notre-Dame Ouest, Montréal, QC H3C 1K3, Canada
Author to whom correspondence should be addressed.
Received: 10 January 2018 / Revised: 31 January 2018 / Accepted: 5 February 2018 / Published: 10 February 2018
(This article belongs to the Special Issue Sensor Technologies for Health Monitoring of Composite Structures)
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Structural health monitoring is a prominent alternative to the scheduled maintenance of safety-critical components. The nondispersive nature as well as the through-thickness mode shape of the fundamental shear horizontal guided wave mode (SH 0 ) make it a particularly attractive candidate for ultrasonic guided wave structural health monitoring. However, plane wave excitation of SH 0 at a high level of purity remains challenging because of the existence of the fundamental Lamb modes (A 0 and S 0 ) below the cutoff frequency thickness product of high-order modes. This paper presents a piezoelectric transducer concept optimized for plane SH 0 wave transduction based on the transducer geometry. The transducer parameter exploration was initially performed using a simple analytical model. A 3D multiphysics finite element model was then used to refine the transducer design. Finally, an experimental validation was conducted with a 3D laser Doppler vibrometer system. The analytical model, the finite element model, and the experimental measurement showed excellent agreement. The modal selectivity of SH 0 within a 20 beam opening angle at the design frequency of 425 kHz in a 1.59 mm aluminum plate was 23 dB, and the angle of the 6 dB wavefront was 86 . View Full-Text
Keywords: ultrasound; structural health monitoring; guided waves; shear horizontal waves; transducer; piezoceramic ultrasound; structural health monitoring; guided waves; shear horizontal waves; transducer; piezoceramic

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Boivin, G.; Viens, M.; Belanger, P. Plane Wave SH0 Piezoceramic Transduction Optimized Using Geometrical Parameters. Sensors 2018, 18, 542.

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